my $str="17:43:33:21:23:19:27:6";
my @aux = split /:/, $str;
my @ary = map {($aux[2*$_+1]) x  $aux[2*$_]} 0 .. @aux/2-1;

[download]

UPDATE:
You can try the following code also: 

my $str="17:43:33:21:23:19:27:6";

my %hash = split /:/, $str;

my $adno;

my $rand = rand 100;

my $sum = 0;
for (keys %hash) { # there is no need of sorted keys
    $adno = $hash{$_};
    last if ($sum += $_) > $rand;
}

print $adno;

[download]

UPDATE: sort keys eliminated in 'for'

In reply to Re: $str to %hash to @ary by ccn
in thread $str to %hash to @ary by abaxaba

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.